import pygame
from pygame.locals import *
import sys

pygame.init()
displaysurface = pygame.display.set_mode((400,600))

mySurface = pygame.Surface((50, 50))
mySurface2 = pygame.Surface((50, 100))

mySurface.fill ( (0,0,255) )
mySurface2.fill( (0,255,0) )

while True:
    events = pygame.event.get()
    for event in events:
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    displaysurface.blit(mySurface, (50,50))
    displaysurface.blit(mySurface2, (50,200))
    pygame.display.update()